<template>
	<view>
		<view :class="[navFixed ? 'header_fixed' : '', type == 'transparent' ? 'header_absolute': '', navShadow ? 'header_shadow': '', themeBgColorName]"
		 :style="[navBgColor ? { backgroundImage: navBgColor } : {}, { paddingTop: statusBarHeight + 'px', color: navFontColor, opacity: transparentValue}]">
			<view class="header_content">
				<view class="header_left_box">
					<slot name="left">
						<view class="header_left_info" :class="[isTwoBtn ? 'header_btnMongol' : '' , isWhite && isTwoBtn ? 'header_colorWhite_btnMongol' : '']"
						 v-if="back || $slots.left || home">
							<view class="header_left_back" :class="[ isTwoBtn ? 'header_btnMongol_left_back' : '' ]" v-if="back && !firstPage"
							 @click="onBackPage">
								<image class="header_icon" v-if="isWhite" src="/static/nav-bar/icon_back_white.png" mode="aspectFit"></image>
								<image class="header_icon" v-else src="/static/nav-bar/icon_back_black.png" mode="aspectFit"></image>
							</view>
							<text class="header_left_line" :class="[isWhite ? 'header_colorWhite_left_line' : '']" v-if="isTwoBtn"></text>
							<view class="header_left_home" :class="[isTwoBtn ? 'header_btnMongol_left_home' : '']" v-if="(firstPage && back) || home"
							 @click="onBackHome">
								<image class="header_icon" v-if="isWhite" src="/static/nav-bar/icon_home_white.png" mode="aspectFit"></image>
								<image class="header_icon" v-else src="/static/nav-bar/icon_home_black.png" mode="aspectFit"></image>
							</view>
						</view>
					</slot>
					<view class="header_title" v-if="!titleCenter && ($slots.default || navTitle)" :style="{ color: navFontColor }">
						<slot>
							<text :style="{ color: navFontColor }">{{ navTitle }}</text>
						</slot>
					</view>
				</view>
				<view class="header_title header_title_center" v-if="titleCenter && ($slots.default || navTitle)" :style="{ color: navFontColor }">
					<slot>
						<text :style="{ color: navFontColor }">{{ navTitle }}</text>
					</slot>
				</view>
				<view class="header_right_info">
					<slot name="right"></slot>
				</view>
			</view>
		</view>
		<view class="header_transparentFixed header_fixed" v-if="type == 'transparentFixed'" :style="{ paddingTop: statusBarHeight + 'px', color: navTransparentFixedFontColor, opacity: 1 - transparentValue, zIndex: transparentValue < 0.3 ? 100 : 90}">
			<view class="header_content">
				<view class="header_left_box">
					<slot name="transparentFixedLeft">
						<view class="header_left_info header_transparentFixed_left_info" :class="[ isWhite ? 'header_transparentFixed_colorWhite_left_info' : '' ]"
						 v-if="back || $slots.left || home">
							<view class="header_left_back" :class="[ isTwoBtn ? 'header_btnMongol_left_back' : '' ]" v-if="back && !firstPage"
							 @click="onBackPage">
								<image class="header_icon" v-if="isWhite" src="/static/nav-bar/icon_back_white.png" mode="aspectFit"></image>
								<image class="header_icon" v-else src="/static/nav-bar/icon_back_black.png" mode="aspectFit"></image>
							</view>
							<text class="header_left_line" v-if="isTwoBtn"></text>
							<view class="header_left_home" :class="[isTwoBtn ? 'header_btnMongol_left_home' : '']" v-if="(firstPage && back) || home"
							 @click="onBackHome">
								<image class="header_icon" v-if="isWhite" src="/static/nav-bar/icon_home_white.png" mode="aspectFit"></image>
								<image class="header_icon" v-else src="/static/nav-bar/icon_home_black.png" mode="aspectFit"></image>
							</view>
						</view>
					</slot>
					<view class="header_title" v-if="!titleCenter && (navTitle || $slots.transparentFixed)" :style="{ color: navTransparentFixedFontColor }">
						<slot name="transparentFixed">
							<text :style="{ color: navTransparentFixedFontColor }">{{ navTitle }}</text>
						</slot>
					</view>
				</view>
				<view class="header_title header_title_center" v-if="titleCenter && (navTitle || $slots.transparentFixed)" :style="{ color: navTransparentFixedFontColor }">
					<slot name="transparentFixed">
						<text :style="{ color: navTransparentFixedFontColor }">{{ navTitle }}</text>
					</slot>
				</view>
				<view class="header_right_info">
					<slot name="transparentFixedRight"></slot>
				</view>
			</view>
		</view>
		<view v-if="type == 'fixed'" :style="{ paddingTop: statusBarHeight + 'px' }">
			<view class="header_station"></view>
		</view>
	</view>
</template>
<script>
	// 主页页面的页面路径
	// 关联功能：打开的页面只有一个的时候右上角自动显示返回首页按钮，下面这个数组是排除显示返回首页的页面。
	// 主页使用场景：小程序分享出去的页面，用户点击开是分享页面，很多情况下是没有返回首页按钮的
	const mainPagePath = ['pages/index/index', 'pages/me/me', 'pages/feeds/feeds', 'pages/store/store'];
	//返回首页的地址
	const homePath = '/pages/index/index';
	//白色表达值
	const whiteList = ['#FFF', '#fff', '#FFFFFF', '#ffffff', 'white', 'rgb(255,255,255)', 'rgba(255,255,255,1)'];
	export default {
		props: {
			//是否显示返回按钮
			// 1000 显示返回按钮
			// 2000 不显示返回按钮
			// 3000 自定义返回按钮方法，点击返回箭头后会发送一个backClick事件
			backState: {
				type: [String, Number],
				default: function() {
					return 1000;
				}
			},
			//是否显示返回首页按钮
			// 1000 显示首页按钮
			// 2000 不显示首页按钮
			// 3000 自定义首页按钮方法，点击首页箭头后会发送一个homeClick事件
			homeState: {
				type: [String, Number],
				default: function() {
					return 2000;
				}
			},
			//导航背景色，支持渐变
			bgColor: {
				type: [String, Array],
				default: function() {
					return '#FFFFFF';
				}
			},
			// 导航背景色渐变角度
			bgColorAngle: {
				type: [String, Number],
				default: function() {
					return 90;
				}
			},
			//导航字体颜色，字体颜色为白色的时候会把手机状态栏设置为白色，否则为黑色
			fontColor: {
				type: String,
				default: function() {
					return '#000000';
				}
			},
			//标题是否居中
			titleCenter: {
				type: Boolean,
				default: function() {
					return true;
				}
			},
			//标题
			title: {
				type: String,
				default: function() {
					return '';
				}
			},
			//类型 fixed为固定 默认
			// ordinary 普通的 不固定
			// transparent 透明不固定的
			//transparentFixed  透明固定的
			type: {
				type: String,
				default: function() {
					return 'fixed';
				}
			},
			//透明固定的时候字体颜色
			transparentFixedFontColor: {
				type: String,
				default: function() {
					return '#000000';
				}
			},
			// 屏幕滑动距离顶部距离(透明固定导航比传)
			scrollTop: {
				type: Number,
				default: function() {
					return 0;
				}
			},
			// 是否显示阴影
			shadow: {
				type: Boolean,
				default: function() {
					return true;
				}
			}
		},
		data() {
			return {
				//当前页面是否是第一个页面
				firstPage: false,
				//透明度值
				transparentValue: 1,
				//标题
				navTitle: '',
				//字体色
				navFontColor: '#000000',
				//背景色
				navBgColor: '',
				//透明底字体色
				navTransparentFixedFontColor: '#000000',
				// 导航栏高度
				statusBarHeight: 0,
				// 上次显示的导航栏颜色
				lastFrontColor: '',
				themeBgColorName: '',
			};
		},
		computed: {
			back() {
				return this.backState == 1000 || this.backState == 3000;
			},
			home() {
				return this.homeState == 1000;
			},
			//导航固定
			navFixed() {
				if (this.type == 'transparentFixed' || this.type == 'fixed') {
					return true;
				} else {
					return false;
				}
			},
			//导航底部线是否显示
			navShadow() {
				if (this.bgColor && typeof this.bgColor == 'string') {
					return this.shadow && this.type !== 'transparent' && whiteList.includes(this.bgColor);
				} else {
					return false;
				}
			},
			//导航字体是否是白色颜色
			isWhite() {
				return whiteList.includes(this.navFontColor);
			},
			//右上角是否有两个按钮
			isTwoBtn() {
				return (this.backState == 1000 || this.backState == 3000) && this.homeState == 1000 && !this.firstPage;
			}
		},
		watch: {
			title(val) {
				this.navTitle = val;
			},
			fontColor(val) {
				this.navFontColor = val;
				this.settingColor();
			},
			bgColor(val) {
				this.getNavBgColor(val);
			},
			transparentFixedFontColor(val) {
				this.navTransparentFixedFontColor = val;
			},
			scrollTop(val) {
				this.pageScroll({
					scrollTop: val
				});
			}
		},
		//第一次加载
		created() {
			this.navTitle = this.title;
			this.navFontColor = this.fontColor;
			this.getNavBgColor(this.bgColor);
			this.navTransparentFixedFontColor = this.transparentFixedFontColor;
			//获取手机状态栏高度
			this.statusBarHeight = uni.getSystemInfoSync()['statusBarHeight'];
			const _this = this;
			this.pageScroll({
				scrollTop: this.scrollTop
			});
			//获取所有页面
			let currentPages = getCurrentPages();
			let pageLen = currentPages.length;
			//判断是否是第一个页面，如果是有设置back为true的页面，将不显示返回箭头，而显示返回首页按钮
			if (pageLen == 1 && !mainPagePath.includes(currentPages[0].route)) {
				this.firstPage = true;
			}
		},
		//方法
		methods: {
			//返回上一页面
			onBackPage() {
				if (this.backState == 3000) {
					this.$emit('backClick');
				} else {
					uni.navigateBack();
				}
			},
			//返回首页
			onBackHome() {
				if (this.homeState == 3000) {
					this.$emit('homeClick');
				} else {
					uni.reLaunch({
						url: homePath
					});
				}
			},
			pageScroll(e) {
				if (this.type == 'transparentFixed') {
					if (e.scrollTop && e.scrollTop > 0) {
						if (e.scrollTop > 180) {
							this.transparentValue = 1;
						} else {
							this.transparentValue = e.scrollTop / 180;
						}
					} else {
						this.transparentValue = 0;
					}
					this.settingColor();
				}
			},
			// 获取导航背景颜色
			getNavBgColor(val) {
				if (typeof val == 'string') {
					if (this.type == 'transparent') {
						this.navBgColor = '';
					} else if (val.indexOf('#') === -1) {
						this.themeBgColorName = val;
						this.navBgColor = '';
					} else {
						this.navBgColor = 'linear-gradient(90deg,' + val + ',' + val + ')';
					}
				} else if (Array.isArray(val) && val.length >= 2) {
					let navBgColor = 'linear-gradient(' + this.bgColorAngle + 'deg';
					val.forEach(item => {
						if (typeof item == 'string') {
							navBgColor += ',' + item;
						} else if (typeof item == 'object') {
							navBgColor += ',' + item.color + ' ' + item.scale;
						}
					});
					navBgColor += ')';
					this.navBgColor = navBgColor;
				}
			},
			//设置手机状态栏颜色
			settingColor() {
				let navColor = this.navFontColor;
				if (this.type == 'transparentFixed' && this.transparentValue <= 0.5) {
					navColor = this.navTransparentFixedFontColor;
				}
				let frontColor = '#000000';
				if (whiteList.includes(navColor)) {
					frontColor = '#ffffff';
				}
				if (this.lastFrontColor == frontColor) {
					return;
				}
				setTimeout(() => {
					this.lastFrontColor = frontColor;
					// 改变手机状态栏颜色
					uni.setNavigationBarColor({
						frontColor: frontColor,
						backgroundColor: '#FFFFFF'
					});
				}, 150);
			}
		}
	};
</script>
<style lang="scss">
	.header_content {
		/* #ifndef APP-NVUE */
		display: flex;
		/* #endif */
		/* #ifdef MP */
		padding-right: 190rpx;
		box-sizing: border-box;
		/* #endif */
		width: 750rpx;
		align-items: flex-end;
		justify-content: space-between;
		flex-direction: row;
		height: 88rpx;
		position: relative;
		z-index: 9999;
	}

	.header_station {
		height: 88rpx;
	}

	.header_shadow {
		// border-style: solid;
		// border-width: 2rpx;
		// border-color: #f5f5f5;
		box-shadow: 0 0 6rpx 0 #ddd;
	}

	.header_fixed {
		position: fixed;
		top: 0;
		left: 0;
		width: 750rpx;
		z-index: 99;
	}

	.header_absolute {
		position: absolute;
		top: 0;
		left: 0;
		z-index: 99;
		width: 750rpx;
		background-color: transparent !important;
	}

	.header_left_box {
		/* #ifndef APP-PLUS-NVUE */
		display: flex;
		/* #endif */
		flex-direction: row;
		align-items: center;
		height: 88rpx;
		flex: 1;
	}

	.header_left_line {
		height: 30rpx;
		width: 2rpx;
		background-color: rgba(255, 255, 255, 0.4);
	}

	.header_left_back {
		width: 56rpx;
		height: 100%;
		/* #ifndef APP-PLUS-NVUE */
		display: flex;
		/* #endif */
		align-items: center;
		justify-content: center;
	}

	.header_icon {
		width: 30rpx;
		height: 30rpx;
	}

	.header_left_home {
		width: 56rpx;
		height: 100%;
		/* #ifndef APP-PLUS-NVUE */
		display: flex;
		/* #endif */
		align-items: center;
		justify-content: center;
	}

	.header_left_info {
		/* #ifndef APP-PLUS-NVUE */
		display: flex;
		/* #endif */
		flex-direction: row;
		align-items: center;
		height: 56rpx;
		margin-left: 16rpx;
	}

	.header_title {
		height: 88rpx;
		font-size: 32rpx;
		padding-left: 30rpx;
		padding-right: 30rpx;
		font-weight: 700;
		text-overflow: ellipsis;
		/* #ifndef APP-PLUS-NVUE */
		white-space: nowrap;
		display: flex;
		overflow: hidden;
		/* #endif */
		/* #ifdef APP-PLUS-NVUE */
		lines: 1;
		/* #endif */
		flex-direction: row;
		align-items: center;
		justify-content: center;
		/* #ifdef MP */
		max-width: calc(100vw - 160rpx);
		/* #endif */
	}

	.header_title_center {
		position: absolute;
		bottom: 0rpx;
		left: 375rpx;
		transform: translateX(-50%);
	}

	.header_right_info {
		height: 88rpx;
		/* #ifndef APP-PLUS-NVUE */
		display: flex;
		flex-shrink: 0;
		/* #endif */
		flex-direction: row;
		align-items: center;
	}

	.header_btnMongol {
		border-radius: 33rpx;
		border-style: solid;
		border-width: 2rpx;
		border-color: rgba(0, 0, 0, 0.1);
		background-color: rgba(255, 255, 255, 0.7);
		/* #ifndef APP-PLUS-NVUE */
		box-sizing: border-box;
		/* #endif */
	}

	.header_btnMongol_left_back,
	.header_btnMongol_left_home {
		width: 70rpx;
	}

	.header_transparentFixed {
		border-bottom-width: 0;
		background-color: transparent;
		background-image: transparent;
	}

	.header_transparentFixed_left_info {
		border-style: solid;
		border-width: 2rpx;
		border-color: rgba(0, 0, 0, 0.1);
		background-color: rgba(255, 255, 255, 0.7);
		border-radius: 33rpx;
		/* #ifndef APP-PLUS-NVUE */
		box-sizing: border-box;
		/* #endif */
	}

	.header_transparentFixed_colorWhite_left_info {
		border-style: solid;
		border-width: 2rpx;
		border-color: rgba(255, 255, 255, 0.3);
		background-color: rgba(0, 0, 0, 0.2);
	}

	//颜色白色
	.header_colorWhite_btnMongol {
		border-style: solid;
		border-width: 2rpx;
		border-color: rgba(255, 255, 255, 0.3);
		background-color: rgba(0, 0, 0, 0.2);
	}

	.header_colorWhite_left_line {
		background-color: rgba(255, 255, 255, 0.3);
	}
</style>
